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We propose using coherent optical spectroscopy to study and control optically‐forbidden (dark) biexciton states in crystals of cuprous oxide. These states are revealed in the correlation spectra cross resonances due to coherence with the quadrupole allowed 1S exciton manifold. The signal is obtained by means of sum‐over‐state formalism and comparing equations of motion for the weakly interacting quadrupole...
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